1 /* Helpers for initial module or kernel cmdline parsing
2 Copyright (C) 2001 Rusty Russell.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/device.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/ctype.h>
29 /* Protects all built-in parameters, modules use their own param_lock */
30 static DEFINE_MUTEX(param_lock
);
32 /* Use the module's mutex, or if built-in use the built-in mutex */
34 #define KPARAM_MUTEX(mod) ((mod) ? &(mod)->param_lock : ¶m_lock)
36 #define KPARAM_MUTEX(mod) (¶m_lock)
39 static inline void check_kparam_locked(struct module
*mod
)
41 BUG_ON(!mutex_is_locked(KPARAM_MUTEX(mod
)));
44 static inline void check_kparam_locked(struct module
*mod
)
47 #endif /* !CONFIG_SYSFS */
49 /* This just allows us to keep track of which parameters are kmalloced. */
50 struct kmalloced_param
{
51 struct list_head list
;
54 static LIST_HEAD(kmalloced_params
);
55 static DEFINE_SPINLOCK(kmalloced_params_lock
);
57 static void *kmalloc_parameter(unsigned int size
)
59 struct kmalloced_param
*p
;
61 p
= kmalloc(sizeof(*p
) + size
, GFP_KERNEL
);
65 spin_lock(&kmalloced_params_lock
);
66 list_add(&p
->list
, &kmalloced_params
);
67 spin_unlock(&kmalloced_params_lock
);
72 /* Does nothing if parameter wasn't kmalloced above. */
73 static void maybe_kfree_parameter(void *param
)
75 struct kmalloced_param
*p
;
77 spin_lock(&kmalloced_params_lock
);
78 list_for_each_entry(p
, &kmalloced_params
, list
) {
79 if (p
->val
== param
) {
85 spin_unlock(&kmalloced_params_lock
);
88 static char dash2underscore(char c
)
95 bool parameqn(const char *a
, const char *b
, size_t n
)
99 for (i
= 0; i
< n
; i
++) {
100 if (dash2underscore(a
[i
]) != dash2underscore(b
[i
]))
106 bool parameq(const char *a
, const char *b
)
108 return parameqn(a
, b
, strlen(a
)+1);
111 static bool param_check_unsafe(const struct kernel_param
*kp
,
114 if (kp
->flags
& KERNEL_PARAM_FL_UNSAFE
) {
115 pr_warn("Setting dangerous option %s - tainting kernel\n",
117 add_taint(TAINT_USER
, LOCKDEP_STILL_OK
);
120 if (kp
->flags
& KERNEL_PARAM_FL_HWPARAM
&&
121 kernel_is_locked_down("Command line-specified device addresses, irqs and dma channels"))
126 static int parse_one(char *param
,
129 const struct kernel_param
*params
,
134 int (*handle_unknown
)(char *param
, char *val
,
135 const char *doing
, void *arg
))
141 for (i
= 0; i
< num_params
; i
++) {
142 if (parameq(param
, params
[i
].name
)) {
143 if (params
[i
].level
< min_level
144 || params
[i
].level
> max_level
)
146 /* No one handled NULL, so do it here. */
148 !(params
[i
].ops
->flags
& KERNEL_PARAM_OPS_FL_NOARG
))
150 pr_debug("handling %s with %p\n", param
,
152 kernel_param_lock(params
[i
].mod
);
153 if (param_check_unsafe(¶ms
[i
], doing
))
154 err
= params
[i
].ops
->set(val
, ¶ms
[i
]);
157 kernel_param_unlock(params
[i
].mod
);
162 if (handle_unknown
) {
163 pr_debug("doing %s: %s='%s'\n", doing
, param
, val
);
164 return handle_unknown(param
, val
, doing
, arg
);
167 pr_debug("Unknown argument '%s'\n", param
);
171 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
172 char *parse_args(const char *doing
,
174 const struct kernel_param
*params
,
179 int (*unknown
)(char *param
, char *val
,
180 const char *doing
, void *arg
))
182 char *param
, *val
, *err
= NULL
;
184 /* Chew leading spaces */
185 args
= skip_spaces(args
);
188 pr_debug("doing %s, parsing ARGS: '%s'\n", doing
, args
);
192 int irq_was_disabled
;
194 args
= next_arg(args
, ¶m
, &val
);
196 if (!val
&& strcmp(param
, "--") == 0)
198 irq_was_disabled
= irqs_disabled();
199 ret
= parse_one(param
, val
, doing
, params
, num
,
200 min_level
, max_level
, arg
, unknown
);
201 if (irq_was_disabled
&& !irqs_disabled())
202 pr_warn("%s: option '%s' enabled irq's!\n",
209 pr_err("%s: Unknown parameter `%s'\n", doing
, param
);
212 pr_err("%s: `%s' too large for parameter `%s'\n",
213 doing
, val
?: "", param
);
216 pr_err("%s: `%s' invalid for parameter `%s'\n",
217 doing
, val
?: "", param
);
227 /* Lazy bastard, eh? */
228 #define STANDARD_PARAM_DEF(name, type, format, strtolfn) \
229 int param_set_##name(const char *val, const struct kernel_param *kp) \
231 return strtolfn(val, 0, (type *)kp->arg); \
233 int param_get_##name(char *buffer, const struct kernel_param *kp) \
235 return scnprintf(buffer, PAGE_SIZE, format "\n", \
236 *((type *)kp->arg)); \
238 const struct kernel_param_ops param_ops_##name = { \
239 .set = param_set_##name, \
240 .get = param_get_##name, \
242 EXPORT_SYMBOL(param_set_##name); \
243 EXPORT_SYMBOL(param_get_##name); \
244 EXPORT_SYMBOL(param_ops_##name)
247 STANDARD_PARAM_DEF(byte
, unsigned char, "%hhu", kstrtou8
);
248 STANDARD_PARAM_DEF(short, short, "%hi", kstrtos16
);
249 STANDARD_PARAM_DEF(ushort
, unsigned short, "%hu", kstrtou16
);
250 STANDARD_PARAM_DEF(int, int, "%i", kstrtoint
);
251 STANDARD_PARAM_DEF(uint
, unsigned int, "%u", kstrtouint
);
252 STANDARD_PARAM_DEF(long, long, "%li", kstrtol
);
253 STANDARD_PARAM_DEF(ulong
, unsigned long, "%lu", kstrtoul
);
254 STANDARD_PARAM_DEF(ullong
, unsigned long long, "%llu", kstrtoull
);
256 int param_set_charp(const char *val
, const struct kernel_param
*kp
)
258 if (strlen(val
) > 1024) {
259 pr_err("%s: string parameter too long\n", kp
->name
);
263 maybe_kfree_parameter(*(char **)kp
->arg
);
265 /* This is a hack. We can't kmalloc in early boot, and we
266 * don't need to; this mangled commandline is preserved. */
267 if (slab_is_available()) {
268 *(char **)kp
->arg
= kmalloc_parameter(strlen(val
)+1);
269 if (!*(char **)kp
->arg
)
271 strcpy(*(char **)kp
->arg
, val
);
273 *(const char **)kp
->arg
= val
;
277 EXPORT_SYMBOL(param_set_charp
);
279 int param_get_charp(char *buffer
, const struct kernel_param
*kp
)
281 return scnprintf(buffer
, PAGE_SIZE
, "%s\n", *((char **)kp
->arg
));
283 EXPORT_SYMBOL(param_get_charp
);
285 void param_free_charp(void *arg
)
287 maybe_kfree_parameter(*((char **)arg
));
289 EXPORT_SYMBOL(param_free_charp
);
291 const struct kernel_param_ops param_ops_charp
= {
292 .set
= param_set_charp
,
293 .get
= param_get_charp
,
294 .free
= param_free_charp
,
296 EXPORT_SYMBOL(param_ops_charp
);
298 /* Actually could be a bool or an int, for historical reasons. */
299 int param_set_bool(const char *val
, const struct kernel_param
*kp
)
301 /* No equals means "set"... */
304 /* One of =[yYnN01] */
305 return strtobool(val
, kp
->arg
);
307 EXPORT_SYMBOL(param_set_bool
);
309 int param_get_bool(char *buffer
, const struct kernel_param
*kp
)
311 /* Y and N chosen as being relatively non-coder friendly */
312 return sprintf(buffer
, "%c\n", *(bool *)kp
->arg
? 'Y' : 'N');
314 EXPORT_SYMBOL(param_get_bool
);
316 const struct kernel_param_ops param_ops_bool
= {
317 .flags
= KERNEL_PARAM_OPS_FL_NOARG
,
318 .set
= param_set_bool
,
319 .get
= param_get_bool
,
321 EXPORT_SYMBOL(param_ops_bool
);
323 int param_set_bool_enable_only(const char *val
, const struct kernel_param
*kp
)
327 bool orig_value
= *(bool *)kp
->arg
;
328 struct kernel_param dummy_kp
= *kp
;
330 dummy_kp
.arg
= &new_value
;
332 err
= param_set_bool(val
, &dummy_kp
);
336 /* Don't let them unset it once it's set! */
337 if (!new_value
&& orig_value
)
341 err
= param_set_bool(val
, kp
);
345 EXPORT_SYMBOL_GPL(param_set_bool_enable_only
);
347 const struct kernel_param_ops param_ops_bool_enable_only
= {
348 .flags
= KERNEL_PARAM_OPS_FL_NOARG
,
349 .set
= param_set_bool_enable_only
,
350 .get
= param_get_bool
,
352 EXPORT_SYMBOL_GPL(param_ops_bool_enable_only
);
354 /* This one must be bool. */
355 int param_set_invbool(const char *val
, const struct kernel_param
*kp
)
359 struct kernel_param dummy
;
361 dummy
.arg
= &boolval
;
362 ret
= param_set_bool(val
, &dummy
);
364 *(bool *)kp
->arg
= !boolval
;
367 EXPORT_SYMBOL(param_set_invbool
);
369 int param_get_invbool(char *buffer
, const struct kernel_param
*kp
)
371 return sprintf(buffer
, "%c\n", (*(bool *)kp
->arg
) ? 'N' : 'Y');
373 EXPORT_SYMBOL(param_get_invbool
);
375 const struct kernel_param_ops param_ops_invbool
= {
376 .set
= param_set_invbool
,
377 .get
= param_get_invbool
,
379 EXPORT_SYMBOL(param_ops_invbool
);
381 int param_set_bint(const char *val
, const struct kernel_param
*kp
)
383 /* Match bool exactly, by re-using it. */
384 struct kernel_param boolkp
= *kp
;
390 ret
= param_set_bool(val
, &boolkp
);
395 EXPORT_SYMBOL(param_set_bint
);
397 const struct kernel_param_ops param_ops_bint
= {
398 .flags
= KERNEL_PARAM_OPS_FL_NOARG
,
399 .set
= param_set_bint
,
400 .get
= param_get_int
,
402 EXPORT_SYMBOL(param_ops_bint
);
404 /* We break the rule and mangle the string. */
405 static int param_array(struct module
*mod
,
408 unsigned int min
, unsigned int max
,
409 void *elem
, int elemsize
,
410 int (*set
)(const char *, const struct kernel_param
*kp
),
415 struct kernel_param kp
;
418 /* Get the name right for errors. */
424 /* We expect a comma-separated list of values. */
429 pr_err("%s: can only take %i arguments\n", name
, max
);
432 len
= strcspn(val
, ",");
434 /* nul-terminate and parse */
436 ((char *)val
)[len
] = '\0';
437 check_kparam_locked(mod
);
445 } while (save
== ',');
448 pr_err("%s: needs at least %i arguments\n", name
, min
);
454 static int param_array_set(const char *val
, const struct kernel_param
*kp
)
456 const struct kparam_array
*arr
= kp
->arr
;
457 unsigned int temp_num
;
459 return param_array(kp
->mod
, kp
->name
, val
, 1, arr
->max
, arr
->elem
,
460 arr
->elemsize
, arr
->ops
->set
, kp
->level
,
461 arr
->num
?: &temp_num
);
464 static int param_array_get(char *buffer
, const struct kernel_param
*kp
)
467 const struct kparam_array
*arr
= kp
->arr
;
468 struct kernel_param p
= *kp
;
470 for (i
= off
= 0; i
< (arr
->num
? *arr
->num
: arr
->max
); i
++) {
471 /* Replace \n with comma */
473 buffer
[off
- 1] = ',';
474 p
.arg
= arr
->elem
+ arr
->elemsize
* i
;
475 check_kparam_locked(p
.mod
);
476 ret
= arr
->ops
->get(buffer
+ off
, &p
);
485 static void param_array_free(void *arg
)
488 const struct kparam_array
*arr
= arg
;
491 for (i
= 0; i
< (arr
->num
? *arr
->num
: arr
->max
); i
++)
492 arr
->ops
->free(arr
->elem
+ arr
->elemsize
* i
);
495 const struct kernel_param_ops param_array_ops
= {
496 .set
= param_array_set
,
497 .get
= param_array_get
,
498 .free
= param_array_free
,
500 EXPORT_SYMBOL(param_array_ops
);
502 int param_set_copystring(const char *val
, const struct kernel_param
*kp
)
504 const struct kparam_string
*kps
= kp
->str
;
506 if (strlen(val
)+1 > kps
->maxlen
) {
507 pr_err("%s: string doesn't fit in %u chars.\n",
508 kp
->name
, kps
->maxlen
-1);
511 strcpy(kps
->string
, val
);
514 EXPORT_SYMBOL(param_set_copystring
);
516 int param_get_string(char *buffer
, const struct kernel_param
*kp
)
518 const struct kparam_string
*kps
= kp
->str
;
519 return scnprintf(buffer
, PAGE_SIZE
, "%s\n", kps
->string
);
521 EXPORT_SYMBOL(param_get_string
);
523 const struct kernel_param_ops param_ops_string
= {
524 .set
= param_set_copystring
,
525 .get
= param_get_string
,
527 EXPORT_SYMBOL(param_ops_string
);
529 /* sysfs output in /sys/modules/XYZ/parameters/ */
530 #define to_module_attr(n) container_of(n, struct module_attribute, attr)
531 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
533 struct param_attribute
535 struct module_attribute mattr
;
536 const struct kernel_param
*param
;
539 struct module_param_attrs
542 struct attribute_group grp
;
543 struct param_attribute attrs
[0];
547 #define to_param_attr(n) container_of(n, struct param_attribute, mattr)
549 static ssize_t
param_attr_show(struct module_attribute
*mattr
,
550 struct module_kobject
*mk
, char *buf
)
553 struct param_attribute
*attribute
= to_param_attr(mattr
);
555 if (!attribute
->param
->ops
->get
)
558 kernel_param_lock(mk
->mod
);
559 count
= attribute
->param
->ops
->get(buf
, attribute
->param
);
560 kernel_param_unlock(mk
->mod
);
564 #ifdef CONFIG_MODULES
565 #define mod_name(mod) (mod)->name
567 #define mod_name(mod) "unknown"
570 /* sysfs always hands a nul-terminated string in buf. We rely on that. */
571 static ssize_t
param_attr_store(struct module_attribute
*mattr
,
572 struct module_kobject
*mk
,
573 const char *buf
, size_t len
)
576 struct param_attribute
*attribute
= to_param_attr(mattr
);
578 if (!attribute
->param
->ops
->set
)
581 kernel_param_lock(mk
->mod
);
582 if (param_check_unsafe(attribute
->param
, mod_name(mk
->mod
)))
583 err
= attribute
->param
->ops
->set(buf
, attribute
->param
);
586 kernel_param_unlock(mk
->mod
);
593 #ifdef CONFIG_MODULES
596 #define __modinit __init
600 void kernel_param_lock(struct module
*mod
)
602 mutex_lock(KPARAM_MUTEX(mod
));
605 void kernel_param_unlock(struct module
*mod
)
607 mutex_unlock(KPARAM_MUTEX(mod
));
610 EXPORT_SYMBOL(kernel_param_lock
);
611 EXPORT_SYMBOL(kernel_param_unlock
);
614 * add_sysfs_param - add a parameter to sysfs
615 * @mk: struct module_kobject
616 * @kp: the actual parameter definition to add to sysfs
617 * @name: name of parameter
619 * Create a kobject if for a (per-module) parameter if mp NULL, and
620 * create file in sysfs. Returns an error on out of memory. Always cleans up
621 * if there's an error.
623 static __modinit
int add_sysfs_param(struct module_kobject
*mk
,
624 const struct kernel_param
*kp
,
627 struct module_param_attrs
*new_mp
;
628 struct attribute
**new_attrs
;
631 /* We don't bother calling this with invisible parameters. */
635 /* First allocation. */
636 mk
->mp
= kzalloc(sizeof(*mk
->mp
), GFP_KERNEL
);
639 mk
->mp
->grp
.name
= "parameters";
640 /* NULL-terminated attribute array. */
641 mk
->mp
->grp
.attrs
= kzalloc(sizeof(mk
->mp
->grp
.attrs
[0]),
643 /* Caller will cleanup via free_module_param_attrs */
644 if (!mk
->mp
->grp
.attrs
)
648 /* Enlarge allocations. */
649 new_mp
= krealloc(mk
->mp
,
651 sizeof(mk
->mp
->attrs
[0]) * (mk
->mp
->num
+ 1),
657 /* Extra pointer for NULL terminator */
658 new_attrs
= krealloc(mk
->mp
->grp
.attrs
,
659 sizeof(mk
->mp
->grp
.attrs
[0]) * (mk
->mp
->num
+ 2),
663 mk
->mp
->grp
.attrs
= new_attrs
;
665 /* Tack new one on the end. */
666 memset(&mk
->mp
->attrs
[mk
->mp
->num
], 0, sizeof(mk
->mp
->attrs
[0]));
667 sysfs_attr_init(&mk
->mp
->attrs
[mk
->mp
->num
].mattr
.attr
);
668 mk
->mp
->attrs
[mk
->mp
->num
].param
= kp
;
669 mk
->mp
->attrs
[mk
->mp
->num
].mattr
.show
= param_attr_show
;
670 /* Do not allow runtime DAC changes to make param writable. */
671 if ((kp
->perm
& (S_IWUSR
| S_IWGRP
| S_IWOTH
)) != 0)
672 mk
->mp
->attrs
[mk
->mp
->num
].mattr
.store
= param_attr_store
;
674 mk
->mp
->attrs
[mk
->mp
->num
].mattr
.store
= NULL
;
675 mk
->mp
->attrs
[mk
->mp
->num
].mattr
.attr
.name
= (char *)name
;
676 mk
->mp
->attrs
[mk
->mp
->num
].mattr
.attr
.mode
= kp
->perm
;
679 /* Fix up all the pointers, since krealloc can move us */
680 for (i
= 0; i
< mk
->mp
->num
; i
++)
681 mk
->mp
->grp
.attrs
[i
] = &mk
->mp
->attrs
[i
].mattr
.attr
;
682 mk
->mp
->grp
.attrs
[mk
->mp
->num
] = NULL
;
686 #ifdef CONFIG_MODULES
687 static void free_module_param_attrs(struct module_kobject
*mk
)
690 kfree(mk
->mp
->grp
.attrs
);
696 * module_param_sysfs_setup - setup sysfs support for one module
698 * @kparam: module parameters (array)
699 * @num_params: number of module parameters
701 * Adds sysfs entries for module parameters under
702 * /sys/module/[mod->name]/parameters/
704 int module_param_sysfs_setup(struct module
*mod
,
705 const struct kernel_param
*kparam
,
706 unsigned int num_params
)
711 for (i
= 0; i
< num_params
; i
++) {
712 if (kparam
[i
].perm
== 0)
714 err
= add_sysfs_param(&mod
->mkobj
, &kparam
[i
], kparam
[i
].name
);
716 free_module_param_attrs(&mod
->mkobj
);
725 /* Create the param group. */
726 err
= sysfs_create_group(&mod
->mkobj
.kobj
, &mod
->mkobj
.mp
->grp
);
728 free_module_param_attrs(&mod
->mkobj
);
733 * module_param_sysfs_remove - remove sysfs support for one module
736 * Remove sysfs entries for module parameters and the corresponding
739 void module_param_sysfs_remove(struct module
*mod
)
742 sysfs_remove_group(&mod
->mkobj
.kobj
, &mod
->mkobj
.mp
->grp
);
743 /* We are positive that no one is using any param
744 * attrs at this point. Deallocate immediately. */
745 free_module_param_attrs(&mod
->mkobj
);
750 void destroy_params(const struct kernel_param
*params
, unsigned num
)
754 for (i
= 0; i
< num
; i
++)
755 if (params
[i
].ops
->free
)
756 params
[i
].ops
->free(params
[i
].arg
);
759 static struct module_kobject
* __init
locate_module_kobject(const char *name
)
761 struct module_kobject
*mk
;
762 struct kobject
*kobj
;
765 kobj
= kset_find_obj(module_kset
, name
);
767 mk
= to_module_kobject(kobj
);
769 mk
= kzalloc(sizeof(struct module_kobject
), GFP_KERNEL
);
772 mk
->mod
= THIS_MODULE
;
773 mk
->kobj
.kset
= module_kset
;
774 err
= kobject_init_and_add(&mk
->kobj
, &module_ktype
, NULL
,
776 #ifdef CONFIG_MODULES
778 err
= sysfs_create_file(&mk
->kobj
, &module_uevent
.attr
);
781 kobject_put(&mk
->kobj
);
782 pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n",
787 /* So that we hold reference in both cases. */
788 kobject_get(&mk
->kobj
);
794 static void __init
kernel_add_sysfs_param(const char *name
,
795 const struct kernel_param
*kparam
,
796 unsigned int name_skip
)
798 struct module_kobject
*mk
;
801 mk
= locate_module_kobject(name
);
805 /* We need to remove old parameters before adding more. */
807 sysfs_remove_group(&mk
->kobj
, &mk
->mp
->grp
);
809 /* These should not fail at boot. */
810 err
= add_sysfs_param(mk
, kparam
, kparam
->name
+ name_skip
);
812 err
= sysfs_create_group(&mk
->kobj
, &mk
->mp
->grp
);
814 kobject_uevent(&mk
->kobj
, KOBJ_ADD
);
815 kobject_put(&mk
->kobj
);
819 * param_sysfs_builtin - add sysfs parameters for built-in modules
821 * Add module_parameters to sysfs for "modules" built into the kernel.
823 * The "module" name (KBUILD_MODNAME) is stored before a dot, the
824 * "parameter" name is stored behind a dot in kernel_param->name. So,
825 * extract the "module" name for all built-in kernel_param-eters,
826 * and for all who have the same, call kernel_add_sysfs_param.
828 static void __init
param_sysfs_builtin(void)
830 const struct kernel_param
*kp
;
831 unsigned int name_len
;
832 char modname
[MODULE_NAME_LEN
];
834 for (kp
= __start___param
; kp
< __stop___param
; kp
++) {
840 dot
= strchr(kp
->name
, '.');
842 /* This happens for core_param() */
843 strcpy(modname
, "kernel");
846 name_len
= dot
- kp
->name
+ 1;
847 strlcpy(modname
, kp
->name
, name_len
);
849 kernel_add_sysfs_param(modname
, kp
, name_len
);
853 ssize_t
__modver_version_show(struct module_attribute
*mattr
,
854 struct module_kobject
*mk
, char *buf
)
856 struct module_version_attribute
*vattr
=
857 container_of(mattr
, struct module_version_attribute
, mattr
);
859 return scnprintf(buf
, PAGE_SIZE
, "%s\n", vattr
->version
);
862 extern const struct module_version_attribute
*__start___modver
[];
863 extern const struct module_version_attribute
*__stop___modver
[];
865 static void __init
version_sysfs_builtin(void)
867 const struct module_version_attribute
**p
;
868 struct module_kobject
*mk
;
871 for (p
= __start___modver
; p
< __stop___modver
; p
++) {
872 const struct module_version_attribute
*vattr
= *p
;
874 mk
= locate_module_kobject(vattr
->module_name
);
876 err
= sysfs_create_file(&mk
->kobj
, &vattr
->mattr
.attr
);
878 kobject_uevent(&mk
->kobj
, KOBJ_ADD
);
879 kobject_put(&mk
->kobj
);
884 /* module-related sysfs stuff */
886 static ssize_t
module_attr_show(struct kobject
*kobj
,
887 struct attribute
*attr
,
890 struct module_attribute
*attribute
;
891 struct module_kobject
*mk
;
894 attribute
= to_module_attr(attr
);
895 mk
= to_module_kobject(kobj
);
897 if (!attribute
->show
)
900 ret
= attribute
->show(attribute
, mk
, buf
);
905 static ssize_t
module_attr_store(struct kobject
*kobj
,
906 struct attribute
*attr
,
907 const char *buf
, size_t len
)
909 struct module_attribute
*attribute
;
910 struct module_kobject
*mk
;
913 attribute
= to_module_attr(attr
);
914 mk
= to_module_kobject(kobj
);
916 if (!attribute
->store
)
919 ret
= attribute
->store(attribute
, mk
, buf
, len
);
924 static const struct sysfs_ops module_sysfs_ops
= {
925 .show
= module_attr_show
,
926 .store
= module_attr_store
,
929 static int uevent_filter(struct kset
*kset
, struct kobject
*kobj
)
931 struct kobj_type
*ktype
= get_ktype(kobj
);
933 if (ktype
== &module_ktype
)
938 static const struct kset_uevent_ops module_uevent_ops
= {
939 .filter
= uevent_filter
,
942 struct kset
*module_kset
;
943 int module_sysfs_initialized
;
945 static void module_kobj_release(struct kobject
*kobj
)
947 struct module_kobject
*mk
= to_module_kobject(kobj
);
948 complete(mk
->kobj_completion
);
951 struct kobj_type module_ktype
= {
952 .release
= module_kobj_release
,
953 .sysfs_ops
= &module_sysfs_ops
,
957 * param_sysfs_init - wrapper for built-in params support
959 static int __init
param_sysfs_init(void)
961 module_kset
= kset_create_and_add("module", &module_uevent_ops
, NULL
);
963 printk(KERN_WARNING
"%s (%d): error creating kset\n",
967 module_sysfs_initialized
= 1;
969 version_sysfs_builtin();
970 param_sysfs_builtin();
974 subsys_initcall(param_sysfs_init
);
976 #endif /* CONFIG_SYSFS */